Hydraulic valve



(No Model.)

' L. MILLER 86 J. 11.3. BRYAN.

HYDRAULIO VALVE. No. 424,718. Patented Apr. 1,1890.

Q/VM/neoomv N. PETR$ Photo-Lithographer. \Valhlrgton, D, C.

UNITED. STATES PATENT OFFICE.

LEWVIS MILLER AND JOHN II. B. BRYAN, OF PHILADELPHIA, PENNSYLVANIA.

HYDRAU LlC VALVE.

SPECIFICATION forming part of Letters Patent No. 424,718, dated April 1,1890.

Application filed October 17, 1889. Serial No- 327,259- (No model.)

To all whom it may concern:

Be it known that we, LEWIS MILLER and JOHN II. B. BRYAN, citizens of theUnited States, residing at Philadelphia, in the county of Philadelphiaand State of Pennsylvania, have invented certain new and usefulImprovements in Hydraulic Valves, of which the following is aspecification, reference being had therein to the accompanying drawing,in which is represented a vertical sectional view of our valve complete.

- The nature of our invention will fully appear in the course of thefollowing specification.

In the drawing, a designates the inlet-passage, and b c the two mainoutlet-passages, the two latter passages leading directly into avalve-chamber d, in which works a valve 6, seated over and normallyclosing the outletpassage 0. The valve 6 has connected to or formedintegral with it a piston f, which works in a vertical cylinder g,located above and communicating with the valve-chamber d, the upper endof this cylinder being closed by a head or gland h. The piston issomewhat larger in diameter than the valve to which it is connected, andis elongated and provided with a vertical central passage f, whichcommunicates with the valve-chamber d by means of a suitable number ofside passages 2'. Closing the upper end of the passage f is aninwardly-opening valve j, which is kept normally pressed up to its seatby means of a spring is in the bottom of the passage f. In order thatthe valve j may be removed whenever desired, the piston is made in twosections and screwed together, as shown.

The main inlet-passage is provided with an automatic check-valve Z andleads into the top of the cylinder, the passage being preferably formedintegral with the cylinder.

Leading from the top of cylinder 9 is a small passage m, which is closedby a small inwardly-opening valve n, the stem of which passes outthrough the head h and is connected to an-operating-lever.

In operation liquid is forced by means of a ram or pump or otherapparatus up into the passage a, past the check-valve Z, into theupperend of the cylinder g, andfrom thence down past the valve j,throughthe passage f t' and valve-chamber d, and, finally, out throughthe outlet-passage b, which latter may lead to a hydraulic press of anydescription. As soon as the required pressure is attained in the pressand the flow of liquid through the valve is stopped the check-valves Zand j, as is evident, will immediately close and hold the liquid underthe pressure attained. Vhile thus under pressure the valves e and n willbe pressed firmly to their seats by the liquid. When it is desired torelieve the pressure and run the liquid off through the passage 0,(which may lead to a tank or other vessel,) it is simply necessary toforce the small valve in- Wardly, whereupon the pressure of liquid uponthe under side of the piston (the piston being larger than valve e) willlift the same and thereby open the valve 6, the small quantity of liquidabove the piston being of course forced off through the'passage m to atank. Before the valve 01 is opened the piston will be prevented fromrising by the liquid confined between the top of the same and thecheck-valve Z. The valve may be employed in hydraulic apparatus of allsorts, but is particularly designed for use in cotton-presses.

Having thus described our invention, what we claim is The combination ofthe outlet-passages b and c, communicating with the valve-chamber d, acylinder g, communicating with the valve-chamber d and closed at itsupper end, a valve 6, closing the passage 0, a hollow piston connectedto the said valve e and working in the cylinder g, the piston beinglarger in diameter than valve 6, the interior of this pistoncommunicating with the valve-chamher by passage i, an automatic valve inthis piston, a valved passage on, leading from the upper portion of thesaid cylinder, and a valved passage or -conduit leading into the top ofsaid cylinder, substantially as described. 4

In testimony whereof we afiix our signatures in presence of twowitnesses.

LEWIS MILLER. JOHN H. B. BRYAN. \Vitnesses:

O. D. DAVIS, HILLYARD SWENEY.

